Health Insurance Marketplace: Summary Enrollment Report For the Initial Annual Open Enrollment Period. Methodological Overview


The data reported here have been generated by the information systems of the Centers for Medicare & Medicaid Services (CMS), based on information reported to CMS by SBMs, and information collected by the FFM for states with HHS-supported or fully run Marketplaces (including those run in partnership with states). Data for certain metrics are not yet available for some SBM states due to information system issues. (Please refer to Appendix F for additional methodological information.)

As discussed earlier, this report includes cumulative data for the initial open enrollment period (10-1-13 to 3-31-14), including additional activity associated with individuals who qualified for a Special Enrollment Period (SEP) because they were “in line” on 3-31-14, as well as those who experienced a qualifying life event or a complex situation related to applying for coverage in the Marketplace. To the extent possible, these counts seek to avoid potential duplication associated with monthly reporting.

This report also includes data on the characteristics of persons who have selected a Marketplace plan (by gender, age, metal level, and financial assistance status for the SBMs and FFM; and for the FFM, by gender and age, gender and metal level, financial assistance status and metal level, and metal level and age). In some cases, the data for certain characteristics of Marketplace plan selections are not yet available. Detailed state-level tables can be found in Appendix E, and in the Addendum to the Marketplace Summary Enrollment Report.28

Please note that for the first time, the Appendices of this report include FFM data on the race/ethnicity (Appendix C) and health insurance coverage status at the time of application (Appendix D) and of the persons who have selected a Marketplace plan through the FFM. While this information is provided for transparency purposes, its quality is low and its use should be limited.

We believe that the information contained in this issue brief provides the most systematic “snapshot” of enrollment-related activity in the Marketplaces to date because the data for the various metrics are counted using comparable definitions for data elements across states, and between the SBMs and FFM. It is important to note that the SBM enrollment-related data that are reported in this issue brief represent state data that have been reported to CMS as of April 29, 2014, and may differ from comparable data that have previously been publicly reported on SBM websites or in media reports because that data may be based on different time periods or metric definitions from those used in this report.

28 The Addendum to the Marketplace Summary Enrollment Report is available at

View full report


"ib_2014Apr_enrollment.pdf" (pdf, 1.31Mb)

Note: Documents in PDF format require the Adobe Acrobat Reader®. If you experience problems with PDF documents, please download the latest version of the Reader®